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A Vibrometer Based on Magnetorheological Optical Resonators
摘要： This paper addresses the feasibility of an optical vibrometer that is based on the shift of the optical modes, also known as whispering gallery modes (WGMs), of a magnetorheological optical resonator. The optical resonator that is used in this study is fabricated by mixing polyvinyl chloride plastisol with magnetically polarizable particles. When a permanent magnet that is located nearby the optical resonator is moved, it induces a perturbation of the morphology of the resonator, due to the magnetostrictive effect. This change in the morphology induces a shift in the optical modes of the resonator. The shift of the optical modes can be related to the displacement of the permanent magnet. The proposed sensor concept is based on monitoring the displacement of a tiny magnet that is attached to a moving surface. The optical quality factor of the resonator used in these studies was of the order of 106. The experimental results show a sensitivity of 0.32 pm/μm and a resolution that is less than 300 nm.
关键词： whispering gallery modes,vibrometer,composites,magnetorheological,optical resonator,smart materials
更新于2025-09-23 15:22:29
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Birefringent Cavities: Effects and Applications of a New Paradigm in CQED
摘要： The enhanced interaction of quantum states of light and matter within an optical resonator is a powerful tool for both addressing fundamental questions of nature and pursuing quantum technologies. Here, we discuss the impact of cavity birefringence – a lifting of the degeneracy of polarisation modes within the resonator – on both of these challenges. A novel model for such systems is experimentally veri?ed by the cavity emission of single photons with time-dependent polarisation states that evolve along their wavepacket [1]. This model is then used to demonstrate how a tailored birefringence allows for enhanced photon emission beyond previous limitations [2].
关键词： polarisation states,CQED,optical resonator,quantum states of light and matter,cavity birefringence,single photons,birefringent cavities
更新于2025-09-12 10:27:22
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Raman laser from an optical resonator with a grafted single-molecule monolayer
摘要： Raman-based technologies have enabled many ground-breaking scientific discoveries related to surface science, single-molecule chemistry and biology. For example, researchers have identified surface-bound molecules by their Raman vibrational modes and demonstrated polarization-dependent Raman gain. However, a surface-constrained Raman laser has yet to be demonstrated because of the challenges associated with achieving a sufficiently high photon population located at a surface to transition from spontaneous to stimulated Raman scattering. Here, advances in surface chemistry and in integrated photonics are combined to demonstrate lasing based on surface stimulated Raman scattering (SSRS). By creating an oriented, constrained Si–O–Si monolayer on the surface of integrated silica optical microresonators, the requisite conditions for SSRS are achieved with low threshold powers (200?μW). The expected polarization dependence of SSRS due to the orientation of the Si–O–Si bond is observed. Owing to the ordered monolayer, the Raman lasing efficiency is improved from ~5% to over 40%.
关键词： surface stimulated Raman scattering,single-molecule monolayer,Raman laser,optical resonator,polarization dependence
更新于2025-09-11 14:15:04
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Two-channel method for measuring losses in a ring optical resonator at a wavelength of 632.8 nm
摘要： A two-channel method is proposed for measuring losses in an optical ring resonator (RR), in which eigenmodes (counter-propagating waves) are excited by means of a Zeeman ring He – Ne laser with a wavelength of 632.8 nm. The measured frequency splitting of the laser counterpropgating waves is used to determine the absolute value of losses in an exemplary RR. The value of losses in the measured RR is determined by comparing the resonance width of the output radiation intensity with the resonance width of the radiation intensity for an exemplary resonator. The algorithm of intensity resonance processing takes into account the distortions caused by the dynamic effect, which allows a significant increase in the accuracy (up to 1 % – 2 %) and sensitivity of the proposed method. The measured losses in the RR with a perimeter of 28 cm constitute 80 – 5000 ppm.
关键词： ring optical resonator,eigenmode losses in the RR,radiation intensity resonances at the RR output,laser gyroscope,ring He – Ne laser with a wavelength of 632.8 nm
更新于2025-09-10 09:29:36
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Wide Bandgap Phase Change Material Tuned Visible Photonics
摘要： Light strongly interacts with structures that are of a similar scale to its wavelength, typically nanoscale features for light in the visible spectrum. However, the optical response of these nanostructures is usually fixed during the fabrication. Phase change materials offer a way to tune the properties of these structures in nanoseconds. Until now, phase change active photonics has used materials that strongly absorb visible light, which limits their application in the visible spectrum. In contrast, Sb2S3 is an underexplored phase change material with a bandgap that can be tuned in the visible spectrum from 2.0 to 1.7 eV. This tuneable bandgap is deliberately coupled to an optical resonator such that it responds dramatically in the visible spectrum to Sb2S3 reversible structural phase transitions. It is shown that this optical response can be triggered both optically and electrically. High-speed reprogrammable Sb2S3 based photonic devices, such as those reported here, are likely to have wide applications in future intelligent photonic systems, holographic displays, and microspectrometers.
关键词： active photonics,phase change materials,optical resonator,structural color,bandgap
更新于2025-09-04 15:30:14